Clarify which fields of `Message` should be filled in in `Messenger.SendChatMessage()`

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Problem

Messenger.SendChatMessage() takes two arguments: context.Context and *Message. The latter is a very complex structure with a protobuf struct embedded. From the sender perspective, it's unclear which fields must be provided.

Implementation

Make it clear which fields are required by either (1) providing a separate method or (2) changing *Message to a simpler struct which will get merged with a new instance of Message within the method.

Acceptance Criteria

1. It is clear which fields are required to send public, private and group messages.

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